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Mit dem Beitritt der DDR zur Bundesrepublik Deutschland gehören die neuen Bundesländer nun auch …
With the accession of the DDR to the Federal Republic of Germany, the new federal states are now also ...
Explanation
The correct answer is "zur Europäischen Union." because it matches the German civic, legal, historical, or institutional fact asked in this question, specifically the topic of neue Bundeslaender EU. The other options do not fit the question correctly.